ceecelius



(No Model.)

L. J. GRBCELIUS.

LIPTING JACK.

'sented Oct. 23, 1888.

EaZ/6765077 Zonas LZ Crece/@Q11 LOUIS J. OREOELIUS, OE sr. LOUIS, MISSOURI, ASSIGNOR OE OEE-HALE To ANDREW WARREN, OE SAME PLACE.

LIFTINGIJACK.

SPECIFICATION rorming part of Letters Patent No. 391,691, dated October 23, 1888.

Application tiled April 10, lSSB. Serial No. 270,218. (No model.)

To aZZ whom it may concern..-

Be it known that I, LOUIS J. GRECELIUS, of St. Louis, in the State of Missouri, have invented a new and useful Improvement in Lifting-Jacks; and I do hereby declare that the following is a full, clear, and exact description of the same.

The invention hereinafter set forth is an iur provemeut upon the liftingjack described in Io certain applications heretofore filed 4by me in the Patent Office of the United States and numbered, respectively, 256,133 and 256,134.

The invention relates more particularly to the gripping mechanism by means of which the lifting-bar is raised or held or lowered; and it is designed and specially fitted for the tapered forni of lifting-bar shown in said applications, but is not necessarily limited to that forni of lifting-bar.

In the accompanying drawings, in which my said invention is illustrated, Figure l represents a central vertical section of the jack with my improved grip, the section being taken across the gripping mechanism. Fig. 2 shows the jack in crosssection on line x x of Fig. 1.

Fig. 3 is a detail View of a modication.

The standard A of the jack' is ol" ordinary construction, having a vertical channel for the lifting-bar a. This bar has a lifting-foot, b,

3o and is made tapering from the upper end downward. The taper may be a plain taper on an entire Side, or it may be formed in a groove such as that shown at c in dotted lines at Fig. 2. In the standard is shown a cham- `3,5 ber, d, on one side, which may be duplicated 0n the other side, if desired. On the inner side it opens into the channel, and, as shown, it is also open on the other side, but it may be closed on the outside and open on the top in- 40 stead, the opening being formed in any way convenient for casting.

The gripping device consists of a wedge, e, the inner face of which bears directly against the face of the lifting-bar, as shown in Fig. l,

I5 and preferably the face of the wedge which bears against the bar is made slightly curved outwardly to allow it to conform to the surface of the bar under all circumstances and in whatever position the tapered bar may happen to be at the time of gripping. The outside face 5o of the wedge bears against a bolt or pin,f, inserted transversely through the walls of the chamber. This face is also preferably slightly curved inwardly, to correspond to the form of the face which bears upon the bar. The difference between the thickness of the upper and lower ends of the wedge should exceed that between the upper and lower ends of the bar, so that as the bar is lifted to bring the lower or thinner end opposite the wedge the latter shall not fall below the bolt, and the thinner end ofthe wedge should be of suficient thickness to give the proper grip upon the upper part of the bar. rIhe bar is shown in its lowest or normal position in full lines, Fig, l, and the position of the wedge e is also shown in full lines, the lower or thinner parts of the wedge bearing at this time upon the bar. As the bar is lifted, the taper form increases the space between the bearingsurface and the bolt f and the wedge drops down into this space, and when the bar is up and the space is largest the larger part of the wedge will be in place between the bearing-surface of the tapered bar and the bolt, as shown in dotted lines at e3, Fig. 1.

The boltf may be in iiXed position forjacks of that class which are used for lighter work or where no lowering is required; but for other kinds of work I have provided, also, in this 8o form of grip a lowering device. For this purpose I slot the walls of the chamber d, as shown in Fig. 3, the slot being inclined, as shown, to align the bearing-face with the center of the pivot and the bolt, and I place the bolt or pin fZ within this slot. Outside of the pin or bolt when in this slot and lying across the face of the wedge I place an eccentric lever, H. Its pivot is in line parallel with the bolt and its eccentric head h bears against the bolt 9o and holds it to the wedge e2. The` amount of eccentricity of the head corresponds to the taper of the lifting-bar, and, obviously, as the lever is turned to bring the lower face of the eccentric head against the bolt,the wedge will be allowed to retract. Supposing the bar to be raised with a load which the operator desires to lower, the wedge is then down, and as the bolt and wedge are permitted to retreat from t je' face of the bar it may slip down, being lilfc `at any point by the eccentric. The operator, holding the eccentric lever, may 5 thus control the load and lower it to any point y and there hold it. This adjustable holding- (mlevgerjH pis substantially the same as that shown in connection with a movable rear wall in one of my aforesaid applications, No. 383,710,and 1o represents here any suitable form of adjustable holder for the pin. When this holding-lever is not used, the bolt-pin is xed, and may be, in fact, a part of the casting itselfybut I prefertoniuse a bolt or pin, as it may then be made r 5 of hardened steel and Inay be removed when worn. The wedge also is made of hardened metal. d jimi' As'iinilar wedge, e', and pinf,as above de- \.sb ribed, `tire also shown in the lifting-head E; ze-'ltytrrllh'is head the pin is fixed, or a fixed bearff'ih'giforl'the wedge, or substantially the same ljlforinlji's inade as a part of the head casting itilseifl i gifting-pin, k, is provided, nxed on ""thf'standard and operating to lift the wedge 2 lioif i-elea's'eit when the head is down by enteri'ihglile in the bottom of the head and strik- *"ihgth-lunder part of the wedge. This perno oliliftsitilieflowering, and is described also in {"bfolnectiln with a roller in my said applicagdtibnl ."Tlie amount of taper of the bar and the lvi'edgn1y be varied; but they must corre- Il'rsjciidlinamount to each other, as heretofore afi -z-expiaiadl' ifhTlieTa-s of the wedge are slightly curved, ggiahwalways give a better bearing-surface on iftlifbr, itle taper of which supplements that '-fhelw'edge and renders the grip secure un- O ffiiiei"allirbumstances, and it is not impaired lll'iythtidtion of dirt or grease upon the bear- 4"ihgsrlfzfr'es.

AWe.b flheiprecise form of the bolt is not material, ffsfiti'rnay be flat or of other forms of cross-secr: Htieuulaathat shown.

l Foroperating the lifting-head,alifting-lever, 4512 sus!lfrtliioyed. (shown in donned nues.) 'Ilis'ieiris provided with a socket portion, '[{yaiiiiiwi 'short arms, a', only one of which H'is-"showniirldotted lines. These arms pass to eithelsi'de'bf the lifting-head,and are connected 5o1With/ilinlrsl2, one of which is shown in dotted @linesftivhich are connected in turn to the liftfirg-headlm'The depression of the lever raises eterni-'agata with it the bar, the grip in the lhetidloperating on the depression of the lever. f'JWlie'ii'1t-lie'liead is lowered, the grip in the standztr'dr'bpe'rates to hold the bar in the positiofntd viilic'h it has been raised. When the Ul flddlis ilibie; lowered, the lever is raised to i) UIIUHL ii mm uji .'-slnlclpw OliJ di; ['iliulv oiill 'lo frrsa'l. iff-u'. lll'l/ :al-invr/ 'all (jl nul :ill 'j llln l all) wil-Jump 'i as: imi; ,uv/ol) ne lower the head unt-il the pin in the standard raises the wedge in the head, and then the operator may lower gradually the load by Inanipulating the holding-lever. A spring-pin, as q or q', may be provided to bear on the wedge; but this is not needed except when the jack is worked in horizontal position.

When thc holder is not used on the wedge in the standard, a lifting device, as shown at M, must be used in connection with the lower Wedge for the purpose of lowering the bar or its load. This device consists of the slide m and a lever, m', to move the same. The chambers, obviously, require no fitting, and the wearing parts are all removable.

I claim-- 1. In combination with the lifting-bar and lifting-lever of a jack and its standard, the bolt and the wedge arranged between the bolt and the face of the lifting-bar, substantially as described.

2. In combination with the lifting-bar and lifting-lever of a jack and its standard, the bolt and the wedge arranged between said bolt and the face of the lifting-bar, said wedge having its faces curved, substantially as described.

3. In combination, the standard of 'a jack, a lifting-bar havingatapered face,aliftinglever, the bolt, and the wedge arranged between said bolt and the tapered face of the lifting-bar, substantially as described.

4. A lifting-jack comprising the following elements: a standard, a lifting-lever, a liftingbar, a wedge arranged in contact with the face of said bar, and an adjustable holder for keeping said Wedge in contact with the face of the bar, or to lessen its contact therewith, substantially as described.

5. In combination with the lifting-bar and lifting-lever of a jack and its standard, a bolt, a wedge arranged between said bolt and the face ofthe lifting-bar, and an adjustable holder, H, for said bolt, substantially as described.

6. In combination with the lifting-bar and lifting-lever of a jack and its chambered standard, asupporting-bolt and a Wedge, e, arranged between said bolt and the face of the liftingbar, the rear face of the wedge having a contour corresponding to the face of the bolt,sub stantially as described.

In testimony whereof Ihave signed my name to this specification in the presence of twosub scribing witnesses.

LOUIS J. CRECELIUS.

Witnesses:

C. D. GREENE, J r., GHAs. A. TrroMrsoN.

ICO

IIO 

